Pump Homeostasis Indicator Using MACD Power Analysis
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Solution Overview
Problem
Detecting adverse events associated with implantable blood pumps is challenging due to the complexity of cardiac pathology in patients and the potential for sensor failure and increased power consumption from implanted sensors.
Innovation Solution
A method and system that calculates a moving average convergence divergence (MACD) based on power consumption to maintain a constant rotational speed of the impeller, generating an alert when the MACD diverges from predetermined thresholds, including a zero-crossing time threshold, to detect conditions such as thrombus, gastrointestinal bleeding, arrhythmia, and right heart failure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sensors are implanted into or onto the VAD to detect operating parameters, then detection capability is improved, but device complexity and power consumption increase
Solution Approach 1:
The patent applies self-service by using the existing power consumption measurements from the VAD's motor controller to detect adverse events. The system serves itself by analyzing its own operational data (power consumption) without requiring external sensors, thereby maintaining detection capability while avoiding additional device complexity
Solution Approach 2:
The patent uses power consumption data as an intermediary to indirectly detect adverse events. Instead of directly measuring physiological parameters with sensors, the system analyzes changes in power consumption patterns that correlate with adverse events like thrombus formation or pump malfunction, serving as a mediator between the pump operation and event detection
2Measurement precision
If sensors are implanted into or onto the VAD to detect operating parameters, then detection capability is improved, but power consumption increases
Solution Approach 1:
The system reuses power consumption data already being collected for motor control purposes. By analyzing this existing data through MACD calculations, the system achieves adverse event detection without requiring additional power for sensor operation, effectively making the detection system self-powered from the existing operational measurements
Solution Approach 2:
The patent extracts adverse event detection capability from the power consumption data that is already being measured for motor control. By separating and analyzing the MACD components from the existing power measurements, the system derives detection functionality without adding separate measurement systems or their associated power requirements
Data Source
AI summary
A method determining adverse events from operation of an implantable blood pump including calculating a moving average convergence divergence (MACD) based on power consumed by the implantable blood pump to maintain a constant rotational speed of an impeller of the implantable blood pump. An alert is generated when the calculated MACD diverges from a predetermined MACD threshold and a predetermined MACD zero-crossing time threshold.